What should I do?

I have found myself wanting to change my whole studies around and try applying for prestigious universities... though the issue I have is I didn't do Alevels, I did a Btec extended diploma. And anywhere I look, those unis look into not only your gcses WHICH I FLOPPED BIG TIME. they also want just a levels. My course was equivalent to 3 levels, but I didn't even get an aaa I got something equivalent to like an abb. (120 ucas points)
OK where I'm heading with this is just should I honestly just give up and study somewhere else or what
I was also just thinking of doing an undergrad somewhere else and then apply to the said unis for a masters but.. I don't know....